等应力轴比FLAC3D实现及其应用

等应力轴比指巷道周边应力均匀分布时的椭圆长短轴之比,在该轴比情况下,周边切向应力无极值,或者说周边应力均匀相等,巷道围岩的位移量按照一定的比例均匀变形。等应力轴比对地下工程的稳定是最有利的,采用有限差分软件FLAC3D对等应力轴比进行了模拟实现。在实际工程中通过实测了解地应力的关系,运用等应力轴效应进行分析对于如何设计和维护巷道具有启发意义。

Realization of Equal-stress Axial Ratio with FLAC3D and Its Application

The equal-stress axial ratio refers to the ratio of the major axis of the ellipse to its minor axis when peripheral stress of the tunnel distributed uniformly.In the case of this axial ratio,the peripheral tangential stress has no extreme value,or the peripheral stress is equal and uniform.The deformation of surrounding rock of the tunnel occurred uniformly according to a certain proportion in this circumstance.Obviously,the equa-stress axial ratio is most favorable to the stability of underground project,and the finite difference software FLAC3D is used to simulate it.In the actual project,the relations of ground stress are known through actual measurement,and the application of equal-stress axis effect for analysis has an enlighten meaning for the design and maintenance of tunnels.